book Maths Puzzle Numerical Ability

How do you simplify an equation like this {{{r^2+3s^2+8r+5^r2}}} ??? Please Help me

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book Other Question

Simplify by rationalizing the denominator:
(/11-/5)
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(/11+5) If the sides of a square are lengthened by 7in. the area becomes 121 in.2 Find The Length of a side of the original square